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Zoom lens and imaging apparatus

A zoom lens, image-side technology, used in image communication, television, optics, etc., can solve the problems of increased aberration, obvious off-axis aberration, etc., and achieve the effect of size suppression, large image circle, and good optical performance

Active Publication Date: 2020-10-09
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the ratio of the lens system described in Patent Document 1 is enlarged to cope with the size of the image circle required in recent years, aberrations increase as the lens system is enlarged, and off-axis aberrations are particularly noticeable.

Method used

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  • Zoom lens and imaging apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] The structure of the zoom lens of embodiment 1 and the moving track are shown in figure 1 , and its illustration method and structure are as described above, so a part of repeated description is omitted here. The zoom lens of Embodiment 1 includes a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, and a fourth lens group G3 having positive refractive power in order from the object side to the image side. Lens group G4 and a fifth lens group G5 with positive refractive power. When zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim, and the second lens group G2, the third lens group G3, and the fourth lens group G4 change the distance between adjacent lens groups. Move along the optical axis Z at intervals. The first lens group G1 includes a 1a lens group G1a having a negative refractive power, a 1b len...

Embodiment 2

[0114] The structure and moving track of the zoom lens of embodiment 2 are shown in Figure 4 . The zoom lens of Example 2 has the same configuration as that of the zoom lens of Example 1 in outline. Regarding the zoom lens of Example 2, the basic lens data are shown in Table 4A and Table 4B, the specifications and variable surface spacing are shown in Table 5, the aspheric coefficients are shown in Table 6, and the aberration diagrams are shown in Figure 5 .

[0115] [Table 4A]

[0116] Example 2

[0117] sn R D Nd vd θgF *1 171.58622 2.900 1.77250 49.60 0.55212 2 48.60432 26.868 3 -92.24749 2.399 1.55032 75.50 0.54001 4 794.16247 0.539 5 88.58331 4.900 1.53996 59.46 0.54418 6 142.91667 2.952 7 140.06699 13.625 1.43700 95.10 0.53364 8 -129.48065 0.125 9 155.09605 2.399 1.84666 23.78 0.61923 10 99.11860 13.898 11 62.26591 13.052 1.43700 95.10 ...

Embodiment 3

[0129] The structure and moving track of the zoom lens of embodiment 3 are shown in Figure 6 . The zoom lens of Example 3 has the same configuration as that of the zoom lens of Example 1 in outline. Regarding the zoom lens of Example 3, the basic lens data are shown in Table 7A and Table 7B, the specifications and variable surface spacing are shown in Table 8, the aspheric coefficients are shown in Table 9, and the aberration diagrams are shown in Figure 7 .

[0130] [Table 7A]

[0131] Example 3

[0132] sn R D Nd vd θgF *1 191.78045 2.900 1.77250 49.60 0.55212 2 49.74501 26.241 3 -92.58733 2.400 1.61800 63.33 0.54414 4 -1130.51571 0.528 5 106.37599 4.460 1.56732 42.84 0.57814 6 179.15187 2.842 7 163.36873 12.490 1.43700 95.10 0.53364 8 -137.01357 0.130 9 173.88007 2.460 1.84666 23.78 0.61923 10 111.63652 14.847 11 62.88399 13.780 1.43700 95....

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Abstract

The invention provides a zoom lens and an imaging apparatus including the zoom lens, wherein the size of the whole system is suppressed, the image circle is large, and the performance is high. The zoom lens consists of, in order from an object side, a positive first lens group, a negative second lens group, a third lens group, a positive fourth lens group, and a positive fifth lens group. During zooming, the second lens group, the third lens group, and the fourth lens group move. The first lens group consists of, in order from an object side, a negative first a lens group, a positive first b lens group that moves during focusing, and a positive first c lens group. The lens closest to the image side of the 1b lens group is a negative meniscus lens having a convex surface facing the object side. The absolute value of the radius of curvature of the lens surface of the first c lens group closest to the object side is smaller than the absolute value of the radius of curvature of the lens surface of the 1b lens group closest to the image side.

Description

technical field [0001] The invention relates to a zoom lens and an imaging device. Background technique [0002] Conventionally, a lens system having a five-group structure is known as a zoom lens used in broadcast video cameras, movie cameras, digital cameras, and the like. For example, the following Patent Document 1 describes a zoom lens that sequentially includes a first lens group with positive refractive power, a second lens group with positive refractive power, a third lens group with positive refractive power, and a lens group with positive refractive power from the object side to the image side. The 4th lens group and the 5th lens group, the 2nd lens group, the 3rd lens group and the 4th lens group move when zooming. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2017-078770 [0004] In recent years, cameras having larger sensor sizes than conventional ones have been used in pursuit of high image quality, and lens systems that can cope with the large im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/167G02B15/20
CPCG02B15/167G02B15/20G02B15/145129G02B15/145125G02B15/177G02B13/009G02B9/60G02B27/0025G02B13/0045H04N23/55H04N23/69
Inventor 田中琢也川名正直岛田泰孝
Owner FUJIFILM CORP
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